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Note 4 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Inventory, Current [Table Text Block]

		December 31,
		201 7				201 6
Raw M aterials		$	14,606			$	14,482
Work in P rocess			2,013				986
Finished P roducts			9,707				7,988
Total		$	26,326			$	23,456

Property, Plant and Equipment [Table Text Block]

		December 31,
		201 7				201 6
Land		$	123			$	123
Buildings and Leasehold I mprovements			7,858				7,757
Machinery and E quipment			50,852				49,722
Furniture and F ixtures			2,005				1,947
Computer Hardware and S oftware			5,338				5,223
Construction in P rogress			535				421
			66,711				65,193
Less – Accumulated Depreciation			(59,141	)			(57,194	)
Total		$	7,570			$	7,999

Schedule of Goodwill [Table Text Block]

		Battery & Energy Products				Communi- cations Systems				Total
Balance – January 1, 2016		$	4,790			$	11,493			$	16,283
Acquisition of Accutronics			4,487				-				4,487
Effect of Foreign Currency T ranslation			(805	)			-				(805	)
Balance – December 31, 2016			8,472				11,493				19,965
Effect of Foreign Currency T ranslation			493				-				493
Balance – December 31, 2017		$	8,965			$	11,493			$	20,458

Schedule of Finite-Lived Intangible Assets [Table Text Block]

		December 31, 201 7
		Cost				Accumulated Amortization				Net
Trademarks		$	3,411			$	-			$	3,411
Customer R elationships			6,618				4,208				2,410
Patents and T echnology			5,545				4,595				950
Distributor R elationships			377				377				-
Trade Name			393				79				314
Total Other Intangible A ssets		$	16,344			$	9,259			$	7,085

		December 31, 201 6
		Cost				Accumulated Amortization				Net
Trademarks		$	3,404			$	-			$	3,404
Customer R elationships			6,395				3,975				2,420
Patents and T echnology			5,455				4,417				1,038
Distributor R elationships			377				368				9
Trade Name			359				36				323
Total Other Intangible A ssets		$	15,990			$	8,796			$	7,194

Finite-lived Intangible Assets Amortization Expense [Table Text Block]

		Year ended December 31,
		201 7				201 6
Research and Development Expense		$	165			$	200
Selling, General and Administrative E xpense			257				303
Total		$	422			$	503

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